Taper boring attachment for milling machines and the like



Nov. 1, 1932. J MAUTE 1,886,287

TAPER BORING ATTACHMENT FOR MILLING MACHINES AND THE LIKE Filed June 24. 1930 2 sheet -sheet 1' Nov. 1, 1932. J. MAUTE 1,886,287

TAPER BORING ATTACHMENT FOR MILLiNG MACHINES AHD THE LIKE Filed June 24. 1930 2 Sheets-Sheet 2 I W M, 5 5 .7 g m Jfiorngz].

Patented Nov. 1, 1932 UNITED STATES mea er JOSEPH MAUTE, OF BUFFALO, NEW YORK TAPER BORING arraonrrnnrros Murine MACHINES- Ann T LIKE.-

Application'filed June 24, 19am Serial no. eeasva' This invention relates generally to improvements in boring mechanisms for use on various types of metal working tools, such as milling machines, drilling machines, boring machines, etc., and more particularly to a taper boringattachment for boring short taper holes such as are used in die work.

One of its objects is the provision of a taper mechanism or attachment of this character which issimple in construction, eific-ient and accurate in operation, and which is readily adjustable to bore holes of varying tapers.

Another object of the invention is to provide a taper attachment which is so designed l5 and constructed as to render it readily applicable to existing boring machines and the like, which is positive and reliable operation, and which can be manufactured at a moderate cost.

Other features of the invention reside in the novel construction and arrangement of parts hereinafter described and particularly pointed out in the appended claims.

In the accompanying drawings:

35 Figure 1 is a side elevation of a milling machine showing my improved taper attach ment applied thereto. Figure 2 is an enlarged longitudinal section of the attachment. Figure 3 is a horizontal section there- 33 of taken on line 33, Figure 2. Figure 4 is a fragmentary sectional side view of the attachment with the housing removed. Fig

ure 5 is a perspective view of thebracket on which the adjustable taper bar is mounted. Figure 6 is a perspective view of the adjustable taper bar. Figure 7 is a similar view of the draw bar. Figure 8 is a longitudinal section showing a modified form of attachment.

Similar characters of reference indicate corresponding parts throughout the several views.

Referring now to Figures 1 to 7, inclusive, wherein my taper boring attachment is shown 4 applied to a milling or like machine,'10 indicates the frame or standard of the machine, 11 the head in which the revolving spindle 12- is mounted, and 13 the work-supporting table which may be adjustably mounted for movement toward and from the boring tool or which may be fired, in which latter case I the spindle head together with the tool would be, adjustable toward and from the work during and after the boring operation.

this particular embodiment of my invention,

however, the attachment has been shown in connection with a machine having a revolving spindle with the work table movable to wardand'fromthe tool. 'At its lower end the spindle is provided with an offset boring head including a fiXed upper section 14- applied'to said spindle and a laterally movable lower section 15 connected to the fixed sectionby a dove-tail tongue and groove 16 and 17, respectively, whereby the lower section turns with the upper section but may be shifted crosswise thereof to adjust the boring'too-l 18 tothe position desired. The boring tool is removably held in the usual manner to the chuck 19 of the boringhead'.

My taper boring attachment is operatively connected to the offset boring head for the purposeof automatically controlling the position or throw of the boring tool in a path inclined to the axis of the boring'head and thereby produce a uniform and accurately tapered hole in the work. In its preferred construction, the attachment consists of a support including a housing or hollow enclosure .20 surrounding the boring head 14, 15 and'fastened' to the machine-head ll by clamping bolt '21 or like fastening means. The lower end of this housing, as shown in F igure2 is open and in its sides it has openings .22 through which access may be had for adjusting the operative parts of the attachment. Revolvably mounted within the housing, and encircling the oifset head and the tool-chuck 19 to; turn therewith and with the spindle 12, as well as to be capable of axial movement relative to these parts, is the taper mechanism of the attachment, includ ingas leeve 23 journaled at its periphery in a. thrust bearing 24 carried by a bearing ring 25 fitted in the housingto slide axially thereof. At one side, this sleeve has an upright lug' orextension 26 for receiving a bracket 27 on which is mounted the taper control devicefor governing the throw of the boring tool to produce the desired taper,

pin 29 applied to the bracket 27. As de-' picted in Figure 2, this taper bar is adjustable about its fulcrum to any desired angle,

within certain limits, relative to the tool-axis and is held in a given set position by clamping lugs 30 bolted or otherwise attached to the bracket 27, as seen clearly in Figure 4, the contiguous edges of the bar and the lugs being preferably curved about the bar-axis. Adj acent its outer side or that portion thereof adjoining the face of the bracket, the taper bar has. a hub-like extension 31 about its fulcrum having gage marks or angular graduations 32 thereon, and the adjoining edge of said bracket has a complementary gage mark 33 thereon for quickly setting the taper bar at the angle desired. At its opposite side and facing the offset boring head 14, 15, in substantially radial relation thereto, is a guide tongue 34, preferably of substantially dove-tail shape in cross section, on which a cross-head or swivel block 35 having a conipanion groove 36 is mounted for relative longitudinal movement, this cross head being operatively connected to the boring head to properly guide the tool in boring a tapered hole.

In machines where the spindle moves downward to feed the boring tool into the work, the cross head is shiftable lengthwise on its guide. tongue, while in machines where the work table is moved to shift the work relative to the tool, the guide tongue is shifted rela tively to the cross-head, with the same re-' sult-ant guiding effect to govern the degree of taper in the hole being bored.

The connection between the taper mechanism and the offset boring head preferably consists of a draw bar 37 which is horizontally disposed between the joint faces of the head-sections 14, 15 and adjustably connected to the movable section 15, as by a bolt 38 engaging an attaching lug 39 projecting outwardly from such movable head and section and passing through a longitudinal slot 40 in said draw bar. At its opposite end, the latter has a yoke or bifurcated member 41 to which the cross-head 35 is attached, as by a transverse fulcrum pin 42, to permit the cross head to assume an angular position relative to the draw bar. Intermediate its ends this draw bar has a longitudinal slot 43 therein through which the shank of the tool chuck 19 extends.

Means are provided for adapting this attachment for use in boring straight holes and for this purpose I provide a clamping yoke 44 which is arranged to extend partially around the offset boring head 14,15 in the plane of its joint to prevent relative lateral movement of the head-sections. As seen in Figures 3 and 4, this clamping yoke is substantially U-shape in plan and overlies one side and the adjoining side covers of the head-sections 14, 15, it being adjustably secured to the upper section 14 by a bolt 45 engaging a vertical slot 46 therein. When the attachment is used for boring taper holes, the clamping yoke is set in the position shown by dotted lines in Figure 4, where it is above the plane of the joint between the head-sections and does'not interfere with the lateral movement of the head. When the attachment is used for boring straight holes, the yoke is lowered to the position across the plane of the joint, as seen in full lines in Figure 4 where it clamps the head-sections against relative lateral movement. a

In Figure 8 I have shown the taper boring attachment applied to a machine having a revolving spindle47 and a slidingquill 48, the tool being moved downwardly relative to the work during the boring operation. In this case, the housing 49 is attached to the machine-head 50 and the revolving sleeve 51 which carries the taper mechanism is ournaled in said housing, but such mechanism including the taper bar 28 and asso: ciated parts, which are identical in construction with those described heretofore, are disposed below the sleeve and outside the housing where they are readily accessible for adjustment. V H A When it is desired to bore a taper hole, the fastening bolt 38 of the draw bar37 is loosened to permit its free sliding movement between the ofi'set head-sections 14, 15, after which the taper bar 28 is adjusted about its 1' fulcrumpin 29 and set at the required angle according to the taper bore desired. When thus set the bolt is tightened and themachine ready for boring holes of the corre-, sponding taper. I j

WVhile manifestly simple and compact in construction, this improved taperboringat-v tachment is efficientand reliable in operation, it is readily adjustable, and its parts are so organized and arranged as to renderthe attachment applicable to various typesof ma-. chines used for boring and milling opera tions. 1

I claim as my invention 1. In a boring machine and the like, the

combination of a laterally displaceable boring head, including horizontally-split sections, a member revolvable with and about said head, the latter and said member being mounted for relative axial movement,- ataper-governing member carried by said revolvable member positioned radially out ward from said head, and means carried by said boring head between the sections thereof for movement in the joint-plane thereof of the boring head, and means carried by said head for movement in the joint-plane of its sections and joined by a swivel connection with said taper-governing member for controlling the degree of displacement of the head during the boring operation.

3. In a boring machine and the like, the combination of a laterally displaceable boring head including horizontally-split sections, a member revolvable with and about said head, the latter and said member being mounted for relative axial movement, a taper bar disposed adjacent to the periphery of and alongside the exterior of said head'and fulcrumed on said revolvable member for angular adjustment relative to the head axis, and a draw bar attached to said head to move laterally with one of its sections and flexibly joined to said taper bar for controlling the degree of displacement of the head during the boring operation.

4. In a boring machine and the like, the combination of a laterally displaceable boring head including split sections relatively shiftable in a horizontal plane, a member revolvable with and about said head, the latter and said member being mounted for relative axial movement, a taper bar disposed adjacent to the periphery of and alongside said head and fu-lcrumed intermediate its ends on said revolvable member for angular adjustment relative to the head axis, a draw bar attached to said head to move laterally with one of its sections in a horizontal plane, and a guide block swiveled on said draw bar and slidingly connected to said taper bar.

5. In a boring machine and the like, the combination of a laterally displaceable boring head, a member revolvable with and about said head, the latter and said member being mounted for relative axial movement, a taper bar disposed adjacent to the periphery of and alongside said head and fulcrumed on said revolvable member for angular adjustment relative to the head axis, a draw bar disposed crosswise of said head at substantially right angles to its axis and adjustably secured thereto for lateral movement therewith, and a guide block swiveled on said draw bar and having a groove therein engaging said taper bar.

6. In a boring machine and the'like, the combination of a laterally displaceable boring head, a member revolvable with and about said head, the latter and said member .being mounted for relative axial movement, a taper bar disposed ad acent tothe periphery of and alongside said head and fulcrumed intermediate its ends on said revolvable member for angular ad ustment relative to the head axis, means for clamping the ends of said taper bar'in a set position of adjustment,

a draw bar disposed crosswise of said head and adjustably secured thereto forhorizontal sliding movement toward and from the taper bar and movable laterally with the boring head, and a guide block swiveled on said draw bar and slidingly connected to said taperbar. V

7. A taper boring'attachment for use on boring and like machines having an offset boring head including split-sections relatively shiftable in a horizontal plane, comprising a support adapted for application to the machine about the boring head, said head being axially movable relatively to said sup head, a taper bar fulcrumed on said sleeve;

and exteriorly of said head for angular adjustment relative to the head axis, and means adapted for attachment to the shiftable sec tion of said head and slidingly connected to said taper bar.

9. A taper boring attachment for use on boring and like machines having an offset boring head including a horizontally-shiftable section, comprising a support adapted for application to the machine about the boring head, said head being axially movable relatively to said support, a sleeve revolvably mounted on the support about said head, a taper bar disposed exteriorly about the head and fulcrumed on said sleeve for I angular adjustment relative to the head axis, a draw bar adapted for connection to the shiftable section of the offset boring head to control its lateral displacement, and guide means for flexibly connecting said draw bar with said taper bar. a

10. A taper boring attachment for use on boring and like machines having an oiiset boring head including a horizontally-shiftable section, comprisinga support adapted for application to the machine about the boring head, said head being axially movable relatively to said support, a sleeve revolvably mounted on the support about said head, a taper bar disposed eXteriorly about the head and fulcrumed on said sleeve for angular adjustment relative to the head axis, a draw bar adapted for connection to the shiftable section of the offset boring head to control its lateral displacement, and a guide block fulcrumed on said draw barand having a guide groove engaging said taper bar.

11. In a boring machine and the like, the

combination of a revolving spindle, an offset boring head mounted thereon and mclud- I ing a fixed section and a movable section shiftab le laterally in a horizontal plane at right angles to the spindle-axis, a member revolvable with and about said boring head, the latter and said member being mounted for relative axial movement, a taper-governing member applied to said revolvable member adjacent its periphery, and means disposed between the joint faces of the boring head sections and movable with the shiftable section of the boring head and connected to said taper-governing member for controlling the degree of displacement of the head during the boring operation.

JOSEPH MAUTE. 

